...Advancion Holdings, LLC's (Advancion) rating reflects its extended debt maturity profile to 2030 and improved liquidity following a completed debt exchange. EBITDA leverage above 9.0x and EBITDA interest coverage below 1.5x continue to constrain financial flexibility. The ratings also reflect Advancion's established position as the sole global producer of nitroalkanes and its high-margin niche additives portfolio, which has significant switching costs. Fitch Ratings forecasts a moderate earnings recovery and a neutral-to-positive FCF outlook....